Does Simple increase the raise or lower limit?

Question

If your pokemon knows Iron Defence it can only use it three times before it says that the Pokemon's defence cant be raised any further, but if that pokemon has the ability "Simple" can Iron Defence be used six times? therefore increasing its defence by 12?

Answer 1

No, it does not increase the limit. It doubles the effectiveness up to the 6 stages. So when you use Iron defense it raises it by 4 stages and after you use it again it stops at 6 stages. So basically what Simple does is save some boosting time.